I think, in the end, it's a matter of 2 particular individuals, not cultural or class or ethnic etc. categories, which may or may not be useful guides. This means that people looking for mates primarily on the basis of nationality class education culture etc. are perhaps not sufficiently interested in anybody in particular. I think marriage has to do with particular relationships between particular people, and to first think in terms of sociological categories is probably a mistake - although tings can still work out, perhaps because of, and perhaps in spite of, this somewhat impersonal attitude.
Who wants to marry a sociological category?

It is called social cohesion.

For those wondering what happened to the couple, they were still married four years after the documentary was shot. I just love happy endings.

This is the ABC news article about the documentary

abcnews.go.com/[...]

Still together after 4 years! Who would have imagined. Good for them. Hope they are happy. That's means he's 64 and probably ready for retirement.

Impossible! He lives in America. That means he will be contributing to the slave labor market. He can be found in either Walmart or McDonalds, working for minimum wage so he can make his monthly Obamacare payments.

Ha.Ha. True!True! He'll retired when he's in a box.

All Chinese women should be forced to go to the university to learn english so they can take care of their useless husbands. hehe.

Well isn't that what your wife did?

I knew my comment would draw you in like a bitch in heat. I received 3 PMs this morning and I was told all about you. (I charge 8400 per year plus cost of books. Usually 5 to 8 students per class).